Siemens Transformer Technology Seminar Stray Flux...

Siemens Transformer Technology SeminarStray Flux Control

Pomona CA, May 24-25, 2016

Siemens AG – Transformers

Stray Flux Control

Why highlight Stray Flux Control

• Keeping products at the forefront of development

• Increased power transmission needs have led todetailed consideration of losses

• SIEMENS has had a special focus on stray fluxcontrol for more than 30 years

• Committees and publications on stray flux control

• ICEM, CEFC, Compumag, ISEF, IGTE Symposium

• Compel, IEEE Trans. On Industry Application, IEEETrans. on Magnetics

1960 1970 1980 1990 2000 2010 2020

Production year

Powerful computational tools

• Detailed analysis of complex geometries

• CAD tools and in-house developedpreprocessors

• Gives a quick overview and allowsidentification of eddy losses in structuralsteel parts

Committed to decreasing losses

• Illustration of the stray loss decrease

• Comparing similar 150 MVA

• Long term advances by adopting newtechnologies

• Customer advantage by decreasedoperating costs

Current practice and development

• Advantages by decreased stray flux losses

• Higher efficiency

• Smaller transformers may be used

• Reduced operating costs

• Safer operation of transformers with strayflux control:

• Avoids local overheating

• Avoids accelerated aging of oil and gasbubble generation

• Appearance of stray flux losses

• Windings, tank, clamping plates, tie barsand yokes

• The crucial step to loss-control

• Calculation of the stray flux distribution

• Experience and ongoing research

• Fast solution of complex problem

• Validated and reliable solutions

Stray flux in transformers Benefits of controlling stray flux

State of the art software and capabilities

• Nonlinear, anisotropic materials

• Eddy current and hysteresis losses

• Static, time-harmonic (with nonlinearity),transient, transient with DC bias, coupledcomputations

Comparison of the losses in transformers

• Larger units require special knowledge

• The Siemens approach guarantees costeffective and safe solution

0%10%20%30%40%50%60%70%80%90%

40 150 200 400 500 800Power rating (MVA)

Ohmic loss Eddy loss in windings Stray loss

Percentage of stray losses in load losses on units of differentpower ratings

Continuous testing and validation

• Comparison of the calculated andmeasured temperature

• Verification of the results and comparisonagainst measurements

Optimization of designs

• Check all critical points

• Understanding the stray flux distribution

• Detailed 3D analyses

• Optimize the shielding solution

• Develop a special shield arrangement

We can offer:

• Access to state of the art software to provide accurate resultsand in-house preprocessors developed to reduce the timetaken to conduct an analysis

• Ability to calculate the stray flux change due to phenomenasuch as geomagnetically induced currents to ensure secureperformance of the transformer during operation

• Experience in reduction of overall losses while finding theoptimal cost efficiency to keep operating costs as low aspossible for our customers

• Results verification through cross-checking calculationsagainst measurements

Detailed stray flux loss simulation models

1200 MVA, 242/24 kV Transformer - 3D FEM models lead to perfect calculation-results of real temperature effects as verified by thermal scanning

Siemens AG - TransformersContact

Martin StösslHead – Global Technology CentreE T TR LPT GTC

Elingasse 38160 WeizAustria

Phone: +43 (51707) 71417Mobile: +43 (664) 80117 71417

E-mail:martin.stoessl@siemens.com

Siemens.com/transformers

Siemens Transformer Technology Seminar Stray Flux...

Documents

Flux: Transformers - tianyuantech.com Transformers xxx Philippe Wendling ... three-phase, single-phase, auto transformer, reactors.. ... References ABB, Alstom

STRAY LOSSES IN TRANSFORMER TANK - zcu.czSTRAY LOSSES IN TRANSFORMER TANK ING.MILAN KRASL, PH.D.. ING.JANA JIŘIČKOVÁ, PH.D. BC.. & ING.ROSTISLAV VLK, PH.D. Abstract: This paper

Stray Flux Acquisition System VSM Installation Rev.3 9478-25I1A … · 2019-04-18 · Title: Stray Flux Acquisition System_VSM_Installation_Rev.3_9478-25I1A-200.book Author: bourdone

IS 11655 (1986): Procedure for stray flux testing of ...IS : 11655 - 1986 2. TERMINOLOGY 2.0 For the purpose of this standard, following definition shall apply. 2.1 Flux Magnetic Leakage

A 57 Transformers within photovoltaic generation plants ......core of the transformer by possibly 15% [14]. Studies also show that the stray losses in Studies also show that the stray

Calculation of Stray Losses and Temperature Distribution in … · method is used to the calculation of stray losses and temperature distribution in power transformer. Introduction

Lesson 8: Transformer Theory and Operation Notes/Lesson 8_et332b.pdf2/4/2016 2 Ideal Transformer Action Lesson 8_et332b.pptx 3 Principle: Stationary coils, time varying flux due to

SA2008-000246 en Influence of Stray Flux on Protection Systems

Is the Stray Voltage Really Stray? - IEEE-SAgrouper.ieee.org/groups/td/dist/stray/files/2006-05-Williams.pdf · Was the Stray Voltage Really Stray? Charlie Williams, P.E., ... Where

Single phase Transformer - electricalclass.files.wordpress.com fileFor a coil of wire, the flux passing through the coil is the product of the number of turns, N , and the flux passing

Electric Machines I - Philadelphia University · 2017. 11. 9. · 2 Table of contents 1 •Introduction 2 •Working Principle of Transformer 3 •Flux in a Transformer 4 •Ideal

Mitigating the negative impact of the stray flux on the ... · PDF filedifferential relay is ... is an efficient numerical technique. Furthermore, using flux ... accuracy of transformer

Parallel Operation of Transformers with Large Non ... · PDF fileThe reactive loss in transformer ... subjected to over fluxing condition [1]. The design flux density ... each transformer

STRAY LOSSES IN TRANSFORMER TANK · 2019-09-27 · 1 3D ELECTROMAGNETIC FORMULATION The calculation of losses in the tank wall of a pad mounted transformer is also formulated using

INFLUENCE OF STRAY FLUX ON PROTECTION SYSTEMS · PDF fileINFLUENCE OF STRAY FLUX ON PROTECTION SYSTEMS Z. Gaji*, ... f x c au s enw tdop r if h v ... the stray flux is essentially

DEVELOPMENT OF INDIA'S FIRST COUPLING TRANSFORMER · PDF fileDC Flux Density Shift in Transformer Core Flux density shifts in the core caused by I DC The magnitude of

Transformers - University of Florida · Transformers 2. The Ideal Transformer - A primary current produces a flux in the core. ... Ideal Transformer – the flux produced by the primary

The Role of Magnetizing and Leakage Inductance in ... · the ratio between total flux-linkage and the current caused by said flux-linkage. 2.2 Inductance in transformers In a transformer

aim trail stray square aim trail stray square

Charalambos A. Charalambous - ucy.ac.cyucy.ac.cy/dir/documents/dir/cchara/CAC_CV2017DEC.pdf · Transformer Core Modelling and Guide on Over Fluxing ... “Stray Current Control Design